Grouping after 7 to 8 shots

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Snow
Posts: 15
Joined: Sun Nov 26, 2017 4:56 am

Grouping after 7 to 8 shots

#1 Postby Snow » Thu Jul 19, 2018 8:26 pm

I have a 26 inch heavy barrelled Howa in 6.5 Creedmoor wearing a Vortex Golden Eagle 15-60 scope. On the bench I have got it holding 1/4 to 1/2 MOA inch groups at 200 meters. The load is a 140 grain Hornady ELDM sitting over 42 grains of AR2208 lit by a Federal 210m in a Nosler custom case. Projectile is seated 20 thou of the lands. The problem is shots wandering after 7 to 8 rounds which I suspect is from heat build up in the barrel despite stretching out the time between shots to the maximum allowed time.
Short of putting a straight bull barrel on it is there any tips or tricks anyone is willing to share that may help this rifle hold a 10 shot group together?

sungazer
Posts: 132
Joined: Fri Mar 17, 2017 7:58 pm

Re: Grouping after 7 to 8 shots

#2 Postby sungazer » Thu Jul 19, 2018 8:50 pm

Is it the factory Howa Barrel or another Aftermarket barrel? if so what is the profile?

Mozzie
Posts: 21
Joined: Sun Feb 11, 2018 5:47 pm
Location: Cairns

Re: Grouping after 7 to 8 shots

#3 Postby Mozzie » Fri Jul 20, 2018 7:44 am

Snow
Out of curiosity is this in a custom or factory stock, if custom is it bedded ? The factory stock seems very flexible in forend and if shooting of bipod or rest, let’s just say watching the stock under recoil it is not the most rigid. Do you have any photos.
Cheers
Mozzie
My truck doesn’t run on love, it runs on diesel.
However, I love my rifle and it runs on lead. #-o

AlanF
Posts: 6828
Joined: Wed Jun 15, 2005 8:22 pm
Location: Maffra, Vic

Re: Grouping after 7 to 8 shots

#4 Postby AlanF » Fri Jul 20, 2018 9:13 am

Snow wrote:I have a 26 inch heavy barrelled Howa in 6.5 Creedmoor wearing a Vortex Golden Eagle 15-60 scope. On the bench I have got it holding 1/4 to 1/2 MOA inch groups at 200 meters. The load is a 140 grain Hornady ELDM sitting over 42 grains of AR2208 lit by a Federal 210m in a Nosler custom case. Projectile is seated 20 thou of the lands. The problem is shots wandering after 7 to 8 rounds which I suspect is from heat build up in the barrel despite stretching out the time between shots to the maximum allowed time.
Short of putting a straight bull barrel on it is there any tips or tricks anyone is willing to share that may help this rifle hold a 10 shot group together?

Another possibility is that the barrel is fouling? The test is to see if it returns to good groups after leaving it to get cold again (without cleaning).

BRETT B
Posts: 208
Joined: Fri Sep 30, 2005 2:37 pm
Location: PERTH

Re: Grouping after 7 to 8 shots

#5 Postby BRETT B » Fri Jul 20, 2018 9:54 am

42 grains of AR2208 would seem RED HOT load to me !!
BRETT BUNYAN F CLASS OPEN SHOOTER W.A.

Longranger
Posts: 234
Joined: Sat Mar 02, 2013 9:49 pm
Location: Queensland

Re: Grouping after 7 to 8 shots

#6 Postby Longranger » Fri Jul 20, 2018 7:07 pm

BRETT B wrote:42 grains of AR2208 would seem RED HOT load to me !!


About 6 grains over max in a Creedmoor :shock:

willow
Posts: 192
Joined: Sat Aug 15, 2015 9:51 pm

Re: Grouping after 7 to 8 shots

#7 Postby willow » Fri Jul 20, 2018 7:28 pm

Longranger wrote:
BRETT B wrote:42 grains of AR2208 would seem RED HOT load to me !!


About 6 grains over max in a Creedmoor :shock:


Yep, I wouldn't go near that load even with 2209.

Mozzie
Posts: 21
Joined: Sun Feb 11, 2018 5:47 pm
Location: Cairns

Re: Grouping after 7 to 8 shots

#8 Postby Mozzie » Mon Jul 23, 2018 6:06 pm

Snow
I’d still like to see photos of your setup of the rifle if you have any ? Also photos of the target with grouping issues also ?
My truck doesn’t run on love, it runs on diesel.
However, I love my rifle and it runs on lead. #-o

macguru
Posts: 1288
Joined: Wed Aug 05, 2009 9:49 am

Re: Grouping after 7 to 8 shots

#9 Postby macguru » Mon Jul 23, 2018 6:37 pm

any extraction problems ??? are you sure you dont mean 2209 ?? any shrapnel ??

Snow
Posts: 15
Joined: Sun Nov 26, 2017 4:56 am

Re: Grouping after 7 to 8 shots

#10 Postby Snow » Tue Jul 24, 2018 6:12 pm

BRETT B wrote:42 grains of AR2208 would seem RED HOT load to me !!

Sorry,,typo on my behalf,,using 2209.
The barrel is Howa's 26 inch varmint and the stock is a GRS. Action has been bedded and barrel is floated.
Will try letting it cool down then shoot another string.
thanks for all the replies

disb
Posts: 38
Joined: Thu Jan 18, 2018 2:56 am

Re: Grouping after 7 to 8 shots

#11 Postby disb » Tue Jul 24, 2018 7:08 pm

GRS Beserk?
Plastic stock version?

Trevor Rhodes
Posts: 106
Joined: Mon Feb 03, 2014 8:31 pm
Location: Woodbrook Vic.

Re: Grouping after 7 to 8 shots

#12 Postby Trevor Rhodes » Tue Jul 24, 2018 8:42 pm

l'm hearing the 6.5 creedmoor's are bad on coppering up.

Snow
Posts: 15
Joined: Sun Nov 26, 2017 4:56 am

Re: Grouping after 7 to 8 shots

#13 Postby Snow » Wed Jul 25, 2018 4:58 am

disb wrote:GRS Beserk?
Plastic stock version?

I am not sure what they are made out of? Black 'plastic' like material?

Snow
Posts: 15
Joined: Sun Nov 26, 2017 4:56 am

Re: Grouping after 7 to 8 shots

#14 Postby Snow » Wed Jul 25, 2018 4:59 am

Trevor Rhodes wrote:l'm hearing the 6.5 creedmoor's are bad on coppering up.

Trevor I am not sure if it is the calibre or the barrel that is responsible but this one of mine coppers up pretty bad. Has fired approx 600 hundred rounds and been cleaned after every session but shows no sign of 'smoothing out'

Snow
Posts: 15
Joined: Sun Nov 26, 2017 4:56 am

Re: Grouping after 7 to 8 shots

#15 Postby Snow » Wed Jul 25, 2018 5:04 am

Mozzie wrote:Snow
I’d still like to see photos of your setup of the rifle if you have any ? Also photos of the target with grouping issues also ?

Hi Mozzie. Will take some photos as soon as I get some free time and post them here. Cheers for your help to, much appreciated.


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